Not many have swapped yet, listing now might push people to swap quicker. But might not, and then so few coins available!
The thing about waiting some time is allowing more people to swap and setup more MN's and staking.
Yeah, that's the tricky thing. And being listed on an exchange doesn't help if no one is selling. I could imagine that the people who have already swapped are the KTK / PHR enthusiasts who don't want to sell right away...